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Stockholders' equity - Common Stock and Undesignated Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2020
Jun. 30, 2020
Sep. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Mar. 31, 2022
Stockholders' Equity            
Common stock, authorized (in shares)     150,000,000 150,000,000   150,000,000
Common stock, par value (in dollars per share)     $ 0.001 $ 0.001   $ 0.001
Undesignated preferred stock, authorized (in shares)     10,000,000 10,000,000    
Preferred stock, Par Value (in dollars per share)     $ 0.001 $ 0.001    
Undesignated preferred shares issued (in shares)     0 0    
Shares issued during period (in shares)     340,000      
Proceeds from issuance of common stock through ATM sales, net of offering costs $ 269,975 $ 107,782 $ 6,700 $ 37,438 $ 0  
Issuance costs and underwriter fees     $ 200      
Stock options            
Stockholders' Equity            
Common stock reserved for issuance (in shares)     18,862,638 18,862,638   16,605,804